20mm Aluminium Crimp Cap, Open Hole, Silver with Pre-fitted PTFE/Grey Butyl Septa. 3mm

Alternative to:
La-Pha-Pack: 20 03 0059, Chromacol: 20-AC-CBT3, National: C4020-39A + C4020-34A (alt.), Fisher: 11742458, VWR: 548-0060